text: The volume of gas increases proportionally to absolute temperature and decreases inversely proportionally to pressure, approximately according to the ideal gas law:
  where:
  * p is the pressure
  * V is the volume
  * n is the amount of substance of gas (moles)
  * R is the gas constant, 8.314 J·Kmol
  * T is the absolute temperature
  To simplify, a volume of gas may be expressed as the volume it would have in standard conditions for temperature and pressure, which are  and 100 kPa.